Cause What to do
The Density setting may be too dark.
In the printer driver, click Extended Settings on the Optional
Settings tab, and then lighten the Density setting.
If the Density setting in the Printing Menu is set to 5, change it
back to 3.
There may be a temporary problem with the toner or
developer.
Try to perform Dev Refresh or Toner Refresh in the Printer
Adjust Menu. Note that Toner Refresh consumes the toner.
See “Printer Adjust Menu” on page 90 for details.
Dots appear in the printout
Cause What to do
The paper path inside the printer may be dusty. Clean internal printer components by printing three pages with
only one character per page.
Your paper may be moist or damp. Do not store paper in a humid or damp environment. Be sure to
use paper that is newly unwrapped.
The paper type setting may not be appropriate for the
loaded paper.
Set the appropriate paper type in the printer driver.
Adjust the TR settings in the Printer Adjust Menu. See“Printer
Adjust Menu” on page 90 for details.
The printer may be being used in a location at a high
altitudes.
Adjust the Highland setting in the Printer Adjust Menu. See
“Printer Adjust Menu” on page 90 for details.
There may be a temporary problem with the toner or
developer.
Try to perform Dev Refresh or Toner Refresh in the Printer
Adjust Menu. Note that Toner Refresh consumes the toner.
See “Printer Adjust Menu” on page 90 for details.
The transfer roller may be dusty. Perform BTR Cleaning in the Printer Adjust Menu. See
“Printer Adjust Menu” on page 90 for details.
The photoconductor unit may be near the end of its
service life.
Replace the photoconductor unit. See “Replacing Consumable
Products/Maintenance Parts” on page 125.
Print quality or tone is uneven
Cause What to do
Your paper may be moist or damp. Do not store paper in a humid or damp environment.
AL-M300/AL-M400 Series User's Guide
Troubleshooting 157
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